28 Questions
What does heterosis refer to?
The phenomenon where the offspring of crosses between species exhibit greater fertility than both parents
What does heritability measure?
The extent to which genetics contribute to differences in traits
What is the selection differential (S) in the context of quantitative genetics?
The difference between the trait mean after selection and the trait mean before selection
What does the response to selection (R) represent?
The survival and reproductive success determined by phenotype
What is phenotypic selection (S) in quantitative genetics?
The determination of survival and reproductive success
How is heritability (h2) calculated using the selection differential (S) and response to selection (R)?
S times R
What is the equation for the response to selection in quantitative genetics?
R = Gb
In quantitative genetics, what does the term 'selection differential' represent?
The difference in the mean of a trait between selected and unselected individuals
What is the workhorse equation for quantitative genetics?
R = h2 S
In the context of quantitative genetics, what do correlated characters pose problems for?
Natural selection
What is the primary reason for using co-variances in quantitative genetics?
To determine the association between two traits
What happens to weight and height in quantitative genetics if there is a positive co-variance between them?
Both increase if one trait is selected for
What does the equation R = h2 S represent in quantitative genetics?
The response to selection with respect to genetic variation
In quantitative genetics, what does the term 'narrow-sense heritability' refer to?
The proportion of total genetic variation that is due to additive genetic effects
What is the primary function of co-variation between traits in quantitative genetics?
To measure genetic correlations between traits
Why do correlated characters pose problems in quantitative genetics?
They complicate natural selection processes
What does the equation R=Gb represent in quantitative genetics?
The response to selection with respect to genetic variation
What is the ultimate source of variation according to the text?
Mutation-selection balance
What does the coefficient of variation (CV) measure?
Dispersion around the mean
What is the ratio of the additive genetic variance to the total phenotypic variation called?
Heritability
What mechanism is common to maintain variation in a population?
Balancing selective forces
What is the occurrence of two or more clearly different morphs or forms in a population called?
Polymorphism
What is the ratio of the standard deviation to the mean called?
Coefficient of variation
What does frequency dependency selection look at?
Reproductive success due to frequency of morphs
What does the partition of variance (Vp) represent?
Total phenotypic variation
What is the ratio of genetic variation due to genetic effects to total phenotypic variation called?
Heritability
What does pleiotropy refer to?
Single gene affects multiple characters
What explains the maintenance of both alleles in a population, as seen in sickle cell anemia?
Balancing selective forces
Test your knowledge on genetics, heritability, and heterosis with this quiz. Explore concepts like the phenomenon of heterosis and the measure of heritability in this challenging quiz.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
